Even though you have used tampons all your life, you will have to get used to the idea of using sanitary pads - at least for about six weeks after your baby is born. There is a very good reason why you are advised to not use tampons after giving birth.
After giving birth, your body gets rid of blood, mucous, tissue from the uterus in the form of a discharge called lochia. As long as you have this flow of lochia, it means that you still have an open wound at the site in your uterus where the placenta was attached. As with any wound, this one is also very vulnerable to infection as well. Tampons could introduce bacteria to the wound, so it is very important to avoid the use of tampons until the wound has healed completely.